package org.dev.app.utils;

import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.IdUtil;
import cn.hutool.poi.excel.BigExcelWriter;
import cn.hutool.poi.excel.ExcelUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.util.IOUtils;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * File工具类，扩展 hutool 工具包
 */
@Slf4j
public class FileUtil extends cn.hutool.core.io.FileUtil {

	/**
	 * 定义GB的计算常量
	 */
	private static final int GB = 1024 * 1024 * 1024;
	/**
	 * 定义MB的计算常量
	 */
	private static final int MB = 1024 * 1024;
	/**
	 * 定义KB的计算常量
	 */
	private static final int KB = 1024;

	/**
	 * 格式化小数
	 */
	private static final DecimalFormat DF = new DecimalFormat("0.00");

	/**
	 * MultipartFile转File
	 */
	public static File toFile(MultipartFile multipartFile) {
		// 获取文件名
		String fileName = multipartFile.getOriginalFilename();
		// 获取文件后缀
		String prefix = "." + getExtensionName(fileName);
		File file = null;
		try {
			// 用uuid作为文件名，防止生成的临时文件重复
			file = File.createTempFile(IdUtil.simpleUUID(), prefix);
			// MultipartFile to File
			multipartFile.transferTo(file);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return file;
	}

	/**
	 * 获取文件扩展名，不带 .
	 */
	public static String getExtensionName(String filename) {
		if ((filename != null) && (filename.length() > 0)) {
			int dot = filename.lastIndexOf('.');
			if ((dot > -1) && (dot < (filename.length() - 1))) {
				return filename.substring(dot + 1);
			}
		}
		return filename;
	}

	/**
	 * Java文件操作 获取不带扩展名的文件名
	 */
	public static String getFileNameNoEx(String filename) {
		if ((filename != null) && (filename.length() > 0)) {
			int dot = filename.lastIndexOf('.');
			if ((dot > -1) && (dot < (filename.length()))) {
				return filename.substring(0, dot);
			}
		}
		return filename;
	}

	/**
	 * 文件大小转换
	 */
	public static String getSize(long size) {
		String resultSize;
		if (size / GB >= 1) {
			//如果当前Byte的值大于等于1GB
			resultSize = DF.format(size / (float) GB) + "GB   ";
		} else if (size / MB >= 1) {
			//如果当前Byte的值大于等于1MB
			resultSize = DF.format(size / (float) MB) + "MB   ";
		} else if (size / KB >= 1) {
			//如果当前Byte的值大于等于1KB
			resultSize = DF.format(size / (float) KB) + "KB   ";
		} else {
			resultSize = size + "B   ";
		}
		return resultSize;
	}

	/**
	 * inputStream 转 File
	 */
	public static File inputStreamToFile(InputStream ins, String name) throws Exception {
		File file = new File(System.getProperty("java.io.tmpdir") + File.separator + name);
		if (file.exists()) {
			return file;
		}
		OutputStream os = new FileOutputStream(file);
		int bytesRead;
		int len = 8192;
		byte[] buffer = new byte[len];
		while ((bytesRead = ins.read(buffer, 0, len)) != -1) {
			os.write(buffer, 0, bytesRead);
		}
		os.close();
		ins.close();
		return file;
	}

	/**
	 * 将文件名解析成文件的上传路径
	 */
	public static File upload(MultipartFile file, String filePath) {
		//String name = getFileNameNoEx(file.getOriginalFilename());
		String suffix = getExtensionName(file.getOriginalFilename());
		StringBuffer nowStr = fileRename();
		try {
			String fileName = nowStr + "." + suffix;
			String path = filePath + fileName;
			// getCanonicalFile 可解析正确各种路径
			File dest = new File(path).getCanonicalFile();
			// 检测是否存在目录
			if (!dest.getParentFile().exists()) {
				dest.getParentFile().mkdirs();
			}
			// 文件写入
			file.transferTo(dest);
			return dest;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public static String fileToBase64(File file) throws Exception {
		FileInputStream inputFile = new FileInputStream(file);
		String base64;
		byte[] buffer = new byte[(int) file.length()];
		inputFile.read(buffer);
		inputFile.close();
		base64 = Base64.encode(buffer);
		return base64.replaceAll("[\\s*\t\n\r]", "");
	}

	/**
	 * 导出excel
	 */
	public static void downloadExcel(List<Map<String, Object>> list, HttpServletResponse response) throws IOException {
		String tempPath = System.getProperty("java.io.tmpdir") + IdUtil.fastSimpleUUID() + ".xlsx";
		File file = new File(tempPath);
		BigExcelWriter writer = ExcelUtil.getBigWriter(file);
		// 一次性写出内容，使用默认样式，强制输出标题
		writer.write(list, true);
		//response为HttpServletResponse对象
		response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
		//test.xls是弹出下载对话框的文件名，不能为中文，中文请自行编码
		response.setHeader("Content-Disposition", "attachment;filename=file.xlsx");
		ServletOutputStream out = response.getOutputStream();
		// 终止后删除临时文件
		file.deleteOnExit();
		writer.flush(out, true);
		//此处记得关闭输出Servlet流
		IoUtil.close(out);
	}

	public static String getFileType(String type) {
		String documents = "txt doc pdf ppt pps xlsx xls docx";
		String music = "mp3 wav wma mpa ram ra aac aif m4a";
		String video = "avi mpg mpe mpeg asf wmv mov qt rm mp4 flv m4v webm ogv ogg";
		String image = "bmp dib pcp dif wmf gif jpg tif eps psd cdr iff tga pcd mpt png jpeg";
		if (image.contains(type)) {
			return "pic";
		} else if (documents.contains(type)) {
			return "txt";
		} else if (music.contains(type)) {
			return "music";
		} else if (video.contains(type)) {
			return "vedio";
		} else {
			return "other";
		}
	}


	public static void checkSize(long maxSize, long size) {
		// 1M
		int len = 1024 * 1024;
		if (size > (maxSize * len)) {
			throw new com.hd.ytl.utils.BadRequestException("文件超出规定大小");
		}
	}

	/**
	 * 判断两个文件是否相同
	 */
	public static boolean check(File file1, File file2) {
		String img1Md5 = getMd5(file1);
		String img2Md5 = getMd5(file2);
		return img1Md5.equals(img2Md5);
	}

	/**
	 * 判断两个文件是否相同
	 */
	public static boolean check(String file1Md5, String file2Md5) {
		return file1Md5.equals(file2Md5);
	}

	private static byte[] getByte(File file) {
		// 得到文件长度
		byte[] b = new byte[(int) file.length()];
		try {
			InputStream in = new FileInputStream(file);
			try {
				in.read(b);
			} catch (IOException e) {
				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return null;
		}
		return b;
	}

	private static String getMd5(byte[] bytes) {
		// 16进制字符
		char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
		try {
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(bytes);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char[] str = new char[j * 2];
			int k = 0;
			// 移位 输出字符串
			for (byte byte0 : md) {
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 下载文件
	 *
	 * @param request  /
	 * @param response /
	 * @param file     /
	 */
	public static void downloadFile(HttpServletRequest request, HttpServletResponse response, File file, boolean deleteOnExit) {
		response.setCharacterEncoding(request.getCharacterEncoding());
		response.setContentType("application/octet-stream");
		FileInputStream fis = null;
		try {
			fis = new FileInputStream(file);
			response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
			IOUtils.copy(fis, response.getOutputStream());
			response.flushBuffer();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (fis != null) {
				try {
					fis.close();
					if (deleteOnExit) {
						file.deleteOnExit();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	public static String getMd5(File file) {
		return getMd5(getByte(file));
	}

	/**
	 * 读取json文件，返回json串
	 *
	 * @param fileName
	 * @return
	 */
	public static String readJsonFile(String fileName) {
		String jsonStr = "";
		try {
			File jsonFile = new File(fileName);
			FileReader fileReader = new FileReader(jsonFile);

			Reader reader = new InputStreamReader(new FileInputStream(jsonFile), "utf-8");
			int ch = 0;
			StringBuffer sb = new StringBuffer();
			while ((ch = reader.read()) != -1) {
				sb.append((char) ch);
			}
			fileReader.close();
			reader.close();
			jsonStr = sb.toString();
			return jsonStr;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public static BufferedImage inputImage(MultipartFile file) {
		BufferedImage srcImage = null;
		try {
			FileInputStream in = (FileInputStream) file.getInputStream();
			srcImage = javax.imageio.ImageIO.read(in);
		} catch (IOException e) {
			System.out.println("读取图片文件出错！" + e.getMessage());
		}
		return srcImage;
	}

	/**
	 * 自动调节精度(经验数值)
	 *
	 * @param size 源图片大小
	 * @return 图片压缩质量比
	 */
	public static float getAccuracy(long size) {
		float accuracy;
		if (size < 400) {
			accuracy = 0.85f;
		} else if (size < 900) {
			accuracy = 0.75f;
		} else if (size < 2047) {
			accuracy = 0.6f;
		} else if (size < 3275) {
			accuracy = 0.44f;
		} else {
			accuracy = 0.4f;
		}
		return accuracy;
	}

	/**
	 * 上传文件重命名
	 *
	 * @return 新的文件名
	 */
	public static StringBuffer fileRename() {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
		String time = sdf.format(new Date());
		StringBuffer buf = new StringBuffer(time);
		Random r = new Random();
		//循环取得三个不大于10的随机整数
		for (int x = 0; x < 3; x++) {
			buf.append(r.nextInt(10));
		}
		return buf;
	}

	/**
	 * 对中文字符进行UTF-8编码
	 *
	 * @param source 要转义的字符串
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public static String transformStyle(String source) throws UnsupportedEncodingException {
		char[] arr = source.toCharArray();
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < arr.length; i++) {
			char temp = arr[i];
			if (isChinese(temp)) {
				sb.append(URLEncoder.encode("" + temp, "UTF-8"));
				continue;
			}
			sb.append(arr[i]);
		}
		return sb.toString();
	}

	/**
	 * 判断是不是中文字符
	 *
	 * @param c
	 * @return
	 */
	public static boolean isChinese(char c) {

		Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);

		if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS

				|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS

				|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A

				|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION

				|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION

				|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {

			return true;

		}
		return false;
	}

	public static void downloadFile(HttpServletResponse response, String filePath, String fileName) {
		InputStream inputStream = null;
		BufferedInputStream bis = null;
		OutputStream outputStream = null;
		try {
			inputStream = FileUtil.class.getClassLoader().getResourceAsStream(filePath);
			response.setContentType("application/octet-stream");
			response.setHeader("content-type", "application/octet-stream;charset=UTF-8");
			// 待下载文件名
			String fileNameEncoded = URLEncoder.encode(fileName, CharsetUtil.UTF_8);
			response.setHeader("Content-Disposition", "attachment; filename=\"" + fileNameEncoded + "\"");
			// 加上设置大小 下载下来的excel文件才不会在打开前提示修复
			if (Objects.nonNull(inputStream)) {
				response.addHeader("Content-Length", String.valueOf(inputStream.available()));
				log.info("fileSize: " + inputStream.available());
			}
			byte[] buff = new byte[1024];
			outputStream = response.getOutputStream();
			bis = new BufferedInputStream(inputStream);
			int read = bis.read(buff);
			while (read != -1) {
				outputStream.write(buff, 0, buff.length);
				outputStream.flush();
				read = bis.read(buff);
			}
		} catch (IOException e) {
			log.error("文件下载失败,e");
		} finally {
			org.apache.commons.compress.utils.IOUtils.closeQuietly(outputStream);
			org.apache.commons.compress.utils.IOUtils.closeQuietly(inputStream);
			org.apache.commons.compress.utils.IOUtils.closeQuietly(bis);
		}
	}
}
